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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0405b0d16591dc85dd2327b1a2bc93d6e2eb663a7e905d6596bf03adc2c13d' 
  AND token = 'TBmUMMLMlMIUu2EdMxnn4Mj5U7tsndAl28yBNbjoSmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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