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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c7974ad969880de29e2eeed39f53e8e6a18f37e9fe459773c8e94481c69f3b' 
  AND token = 'EcAX7z48ypc/SFV1/k0X+943nWO2KmMT2/mTE2Wfl/g=' 
  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"
    }
  }
}