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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6821b886b81c0b6a34cf11d403db3ef0d8c4612f633c2e009fb9322a299a210' 
  AND token = 'auDX9CfVJ/AYArKQhoaRCNzsp4ZSxn/xEZvEk84D4I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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