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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82aefc22dac7ebfdd0d639c6bc7fb56c6b7349b76ff0ce48ee078dee9e444347' 
  AND token = '455PWhuSaJEBdRDOHgxjWxG4ZP7Tp0RBcmiWAGvXg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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