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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210d141b235da306584e65ef0b7b2f2df711d574dd133b08ab45196b172da61b' 
  AND token = 'Dh6JCoMhUBO4gSuDK4089nXUk+aO7QoHuTK66uHXS6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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