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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c774092de243b2d2313d6df4727eeb25ccb61eb67a2491d741fc985009d9be' 
  AND token = '7DcoNa1ILfjAA4Iy7/EaWw4KrFuLKbTDl5Jjdhgj9Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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