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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ee7066f6dc57c4772bccc6ceef622a8977ac4c3ad55df022d3026fb7e4aa8' 
  AND token = 'A9eDxc03jVzXKAQ/P2Uam4FYX7+y4OHf1/7d3QWO8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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