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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a90236c2fed362b56b6b6fd72485fa041a2e25291b24ca2509a2eabed6e562b' 
  AND token = 'l9XW4rtXvMCmDOn8Tl2nsX5K/GxX4qXWb6rwZPkSLmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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