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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60be89153ee8c4ac1f9b672182072d242b05af7f02ffd219798e5dda042334b' 
  AND token = 'OEUvArP2R4qE4NnkbJ8Vi05wS2eMD8t4YdSj+M22G5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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