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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60336368f1237a91c57370b9c872e6f4c63ee6f47b6b611872c5e62ea5d2b7e9' 
  AND token = 'YKSlTVaBD/Nj/PdRSMsPF+lAxwrM/rj2/yA3z0wZ3VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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