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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26802ad08955c1ce2ae2c014e15dd1175381e45d5c33e6fd5822078f989eab9' 
  AND token = 'rSmnOpCpJ7DJhXTEasXrvRDf6D3t4T2zDgh37PT98lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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