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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7831e8f72392d7a382353a0af443273d071a529cdb978df1ccd53799432f0bf' 
  AND token = 'GFrKkKQZ4vf2iK/7hzpZAwUKniLqoEuup8H7C7gkLMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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