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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871aac4e09a03ac993a74a64f65e25d5822f392632990b04c8453b4f9d446512' 
  AND token = '0FjzoAFjBDIxQU84Cfit5rNiA8+UHr6MzHN9tLG1fn8=' 
  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"
    }
  }
}