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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dd525ae1b0d105f65b7c76ccdb985818447403cb33d1ae578f59013342bc80' 
  AND token = 'Q+s8Cn7xE2G7diGyzV9n5o7dxh+P3UIRD0JzezCdgIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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