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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a6b8920a649fa5be8a0127826201113ed30039a318af73ac24aa4babf6260a' 
  AND token = 'v1C+zwE79oW0GnBF3WLtdqZDb0GdndIT6kI8UdqbIjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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