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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ed5db50c0290d205b54bc4dacd234993d6c22cd1e0923a43a9b4141a764d9b' 
  AND token = 'IDAp4pfCEpgZsW/QRUvPFloO2A1RQZ/i1To37HVHA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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