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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb1ca96c1d0417f4d8d9b2e0e4b5e9f80b41195eb664c1c76c75ab96943fd15' 
  AND token = 'IlaL+c4+7BPbhXxm3rBmsaEyt7Wpke5XE/cxCYnJx+s=' 
  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"
    }
  }
}