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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4e520f2ad733c41e96152e8388e96261e781e2ffd8763d3682b7555d5b5584' 
  AND token = 'kQisKp1wHGky1lwIoFm5PcKwwONs6U/ycU0hjLOdmEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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