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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fea420720b9500c634a97cc62a67ad8749bd6190f696f53c9ab90ebba1452ab' 
  AND token = 'yBcIEFeM072Bpp4cw/6daNifTbeFOOx1vP+7FllLCBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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