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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3177faf1957850422f280c22286d75b924ca85b292446be2a105de3f35d458' 
  AND token = 'iewMXGl1pLeI+8Ux+CWA2s8+FWZK0TbUAcO2sLoglyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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