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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36e799b20c3e16918908d96654b49f1d581796e96dfd9ebe3ec0909696f5d9a' 
  AND token = '9tMksKuPGxzV7o2g+Dqd45hdi+1tqvLaxmmZQ4xwBcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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