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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5dc577de6eede572768060697d05ca6f1463124334ef0900ff19cf618ffec6' 
  AND token = '4ihBxX1HEh9jpMli9ARMv6PXyQlKjNUIOJlhzWI9Rp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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