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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d3bbbd691cd6cbee4bc54d2b452da34721d4de5b050ab35e518fd181bef1c' 
  AND token = 'lQFY7zh9CqbzL48ht0Kf7LM+x+5mOzld18t0XrDhf20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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