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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37932f9e76b9d931c80227a47b223b8d21e0a29a8d96f28810f6f56ab16ca6d' 
  AND token = '4/wgVXVAgoOB2SaIKGPMCt9H9aT1SNLIoMAPtslv8qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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