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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75e0bfe2aeb773abe076f54def9513d4f656790773c9ef76b571090518a25bc' 
  AND token = '/2UhLTJOBRsO7MhzihzozDOFR1xY+fbf/YsQH4aVZZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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