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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1c23b573f1314714e94fbf252882582228e2b77cb9b3821f88f18b2e0aac20' 
  AND token = 'VFhfGy/CQgbB02QhKPEJ96UVVep+u7budUCRIVNFf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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