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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0b325a49627f68ea9978a9f2bebcbdf3e23c806b9dab8348964caae26f3429' 
  AND token = '1dYWukeo5lOO0fywk7p1bJiNqU2xA4bEJCX2Nk9+iOA=' 
  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"
    }
  }
}