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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3548ec6a84a0a516095d322d6f8b1488adbab3ad56378da37fd5264fc9ec0940' 
  AND token = '72Fi9VjJi/4eb4M/VfbDxhFsoM826Y8aVD+HnvW0tTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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