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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d16baa043d91ba3021d9aee5a037788a339929f968dd835ae8da54fc876dd56' 
  AND token = '1o6dHg0GLoNHA3t5lQbLymEx4X0L2fglCVv6mUr7iD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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