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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0b7f06dac84eaea7965fec4d6183b4cac4e8921b9986eab1c2e2462b223911' 
  AND token = '268nFkp/bLK0eEjH3T7jCkHypTFqgm9nA7y7XVgooWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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