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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06fc5a8cea2b2c763b0fca9354daa605b5325f4d18994028da1a860c9031f3f' 
  AND token = 'U/n9ZgG9T5XTCr6o0id7ShzEknl5dRi2mAInETTfqj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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