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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c9fb3b314c71bf8e4833abbf7e33847ef0c9d7338aa2f7ae1ab820f9f6576c' 
  AND token = 'HMxhHH8oLS5/ic4az/w77O8raQYFPjeWEWiCGJ4Qxss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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