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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f314fc43a5a7d0a6ec70970b51c90e5282044e28b7b58971f34b2db08170ac83' 
  AND token = 'qQ20Iigix587yiAbyioaA1TEPxI8cdujXQdLZhC6hhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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