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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf07a1bbc448bb4ab64adb0801cf602c28b52c844d0828e688bcf7923f96c184' 
  AND token = 'zRLzlfS8xWpk3cMT9SjMVi6tij3o5017DBz812DzRrA=' 
  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"
    }
  }
}