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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5357ba0c4884405a808789551919af630d0e1777a220ffa51e6bd76932ac6c8' 
  AND token = 'hQ/AQXEUlKY022UWnsO2SHebimAAYgWrN/lLK6wXQi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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