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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2e6b8fd6b0346b2dc15f87203d7ea510a78b9d0c5f508f6068c404061a2e8b' 
  AND token = 'EX/hnAk4xI9Vn22YFJo7haq0RkErR/jV23iK+7Rpcwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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