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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb7ac9f5ccc68fccfee355db9d45e2bbabaca91fb0d76f01aa068024a0c53f5' 
  AND token = 'qGozaVWSRVLaU7HMT0Tgjfzmst+t+JIiTrh/YuTxq6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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