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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681721844f5b3ff347b2b6ff249cd7bd3cda35d5b8cabe2d6c9af88102cccca2' 
  AND token = 'dt5qlOOu1gANz3+nSq60pgXbZ5S2s0EubToDtglILbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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