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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9265cefab51a3c71b3f81ec75855c1e3f9f695bc6418df58a20f7d3175ac6d4' 
  AND token = '07kHUc/gk1mwjHMrx7kZLlx29EsUdd7di/a3inrSPos=' 
  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"
    }
  }
}