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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400dd117dc8ed015d9921c6455358ee291e974e1420395cac76f49a066b6fb50' 
  AND token = 'Tog/fuP5PwkswJSKrfKjueBcTLA9SsbNAYdV7NP8/kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}