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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db54217fc93bab1f164ed523a7e7a3e7daa3a6456b756a5b2caaf5228e32e29' 
  AND token = 'N20SsxuoQt863WhnX9Rlp3/U4eY9NliL1ueRv+Ua3Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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