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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad06ac02ffaa12b1c01db71cf584d60073e9ab1faa0ede8d5c835bf041c6fea3' 
  AND token = 'eTT8M780ijFSmUki89k4Lgd98AyCwcKrXWE2GhOaoCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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