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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2f6721a3fc9296fd3072efbf2d142829b52bb580552eacfc71a8ef239e9559' 
  AND token = '3UBX4NXPCV5DPeF48VaeW4JAkK6bJL5XTai1oSKB/bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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