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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf1624df3c0c222b051be8d749c399190bd8c9b305a1ea12a70a05fee2809d7' 
  AND token = 'QLPM+Sl7EQBnbq0edNygz9v8Ij97F/3yYxS3+wecvCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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