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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1091bae3c058cd5a4ada38fce767d2401e4e7e7b0e63e38c85ddb72595a9946e' 
  AND token = 'TqOtvJmRJgwuSvvRU9i28XkC/HFHmU9MMJQ/9WK/8fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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