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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e099a69029e7dc89bd0a8d0f524786e6c2877990d0f91dc32aa7c2eb860b333c' 
  AND token = 'hJfXRv/cvm+G+ZdsCrUvXujeBMQR6TfPkBbcrNTH7I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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