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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bad76aa2f1f0aa9ecf146323492f624e00586df12b2b1ed960cfe60e4a7962' 
  AND token = 'Zhr2TgPAGOhYq8qaGGh9YQDm5u9KwzDC9ax2+qw40DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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