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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7a6e16d98e2a99bc6ea562cd3430f998a94d89b99f319fd3c3cad77c890110' 
  AND token = 'kYl+NDZvzWrmYu9uH3OzC9TxUAw7bC4wF5jfQe7p9r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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