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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e374be3946cd20e69f6d66fc1e13240cf71ff39867477afe28b26d5a36a14860' 
  AND token = 'I0XJnxoW8WH1GinvcamvJ7KpHCWCua6NOG9IOmp/YiQ=' 
  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"
    }
  }
}