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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb26f8a57def12c6a403b22b29f183d3e0a5f0f963b9b4440abd11e8e24eea18' 
  AND token = 'CnOVVqSqhEnCCmqkRf1OYOHSBy0kKnaL7ycEck8I2JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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