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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0d283253101046b663a4c8ca2226f60a92159eacf5d984fc4c07f7b45ac808' 
  AND token = 'v9XLlJtfPlhLzJQ/kUf6z+4bgg4fKZXAxJJc6nqCeP4=' 
  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"
    }
  }
}