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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773fe3540dfadbc2aeab3a14033f95f85d8aa09ae3946c2a0203496f4f1bea2c' 
  AND token = 'dbd8kLq2szyAVDrlAUK1cc85p9iRYvhOxdivtRxSNRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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