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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5cc529636757d3ca034469d5d2df8d3a331a8eeb7f293717feaf084d2b45f9' 
  AND token = 'iCPevidCZ4J9PE06rl8D9zLzhTJX8yhGKDTRcS9jieE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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