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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ae6cdc868aadd89a143d799b3df27bb99727461f25e0dc14595148a8ea483' 
  AND token = 'eq7N1Y+KkF0Vy/M+OmH5qpSidVltUbE8ZJwXc6GR3dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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