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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe9abe861ecae78103e3b760eaca027adbf7cd745bda6c610b5a767e35dfdfc' 
  AND token = 'nSeKnlB9zby/VJBXUEe4N6RmHPuaQjgL2sSyogJMcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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