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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b4fa891188928bcc6edb413f684bac707962b0cb6be5772b9a5ea423cf3cc7' 
  AND token = 'YkPbdVaY1vq+2Q2Z0TN2H1EscqV7A3f4rtj2nC4t1iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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